The quality of water used in brewing coffee plays a crucial role in determining the taste, aroma, and overall enjoyment of the final cup. According to the Specialty Coffee Association (SCA), water isn’t just a neutral ingredient but an active agent that can significantly influence coffee’s flavor extraction. The SCA has developed a set of standards for water quality, know as the SCA Water for Brewing Standards, to help to achieve the best possible brew. These standards help create a balanced and flavorful cup of coffee by specifying acceptable levels for key water characteristics, such as odor, chlorine, total dissolved solids (TDS), calcium hardness, alkalinity, and pH.
Since coffee is approximately 98% water, the chemical composition of the water significantly influences how flavors are extracted from the coffee grounds. Poor water quality can lead to over-extraction, under-extraction, or undesirable taste characteristics, while properly balanced water enhances the coffee’s natural flavors.
Brewing water should be odor-free and no chlorine. Chlorine can create a chemical aftertaste, while impurities such as sediment can introduce off-flavors.
Concentration of minerals such as calcium and magnesium are important for extracting coffee's flavors and balancing its acidity.
Refers to the concentration of calcium ions in water. Calcium hardness with an acceptable range of 50 - 175 ppm helps extract flavorful compounds from the coffee ground.
Alkalinity of water refers to its ability to neutralize acids. The SCA recommends an alkalinity target of 40 ppm as calcium carbonate, with an acceptable of 40 - 70 ppm.
The pH level of water measure its acidity or alkalinity, and the SCA specifies a pH target of 7.0 (neutral), with an acceptable range of 6.0 - 8.0.

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